I can't toggle browser.warnOnQuit

The problem started when I noticed that firefox has not been confirmed when I closed a window with several tabs. With a little experimentation, I noticed that it would not confirm only when the window closed was not the last open window (i.e. firefox to completely disassociate). Under topic: config, I found "browser.warnOnQuit", which is set to false. The problem is that it wont let me switch to true.
It is probably one of my addons, as a fresh profile does not cause this problem, I just expect that there could be an easy fix.

Firefox 17.0.1 running on windows 7 64 bit

Nevermind, it was a mixture of label the problem which seems to have been fixed by the updated

Tags: Firefox App

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